Beware: There is a seller, on ebay, called SmileNtango, selling RAMs for PC, and they send defective parts, intentionally, so you will send it back, without refund, with the excuse that they have never received it back, all with the blessing of Ebay and Paypal !
FWIW, I've actually ordered RAM from these folks, for two different (and old) laptops/tablets. The RAM worked in the tablet, but the RAM for the laptop did not. They have some very explicit instructions for contacting them for a refund/exchange, and they did send me replacement RAM for the laptop. After two exchanges, I never did get any RAM to work with the laptop, sent everything back, and they issued me a credit.
That said, the process was sufficiently convoluted that I probably wouldn't order RAM from them again. The RAM they sent, BTW, looked like new RAM, not pulls from old equipment (no marks on the contacts to indicate this). In the future, I'll probably just stick with Crucial.